In general, cheaper to INNER JOIN or two separate queries

I need two fields from two different tables. I could either run two
queries, or a single INNER JOIN query:

$r1=mysql_query("SELECT fruit FROM fruits WHERE userid = 1");
$r2=mysql_query("SELECT beer FROM beers WHERE userid = 1");
--or--
$r=mysql_query("SELECT fruits.fruit, beers.beer FROM fruits INNER JOIN
beers ON fruits.userid = beers.userid WHERE beers.userid = 1");

In general, which is preferable? I don't have access to the production
machine to benchmark at the moment, but which is best practice?
Thanks!

--
Dotan Cohen

http://gibberish.co.il
http://what-is-what.com

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